Diagnostic Test for Placement

Check your readiness for Level 2 Class by clicking the picture above (passcode: DChO2026) to complete 40 Multiple-Choice Questions in a consecutive 60 minutes.
Email Dr. Chen (chen@dcho.us) for results and recommended placement.
Level 2 class is designed for motivated students who will take AP Chemistry or equivalence in the fall concurrently to prepare for the USNCO Local Exam 2026.

Check your readiness for Level 3 Class by clicking the picture above (passcode: DChO2026) to complete 60 Multiple-Choice Questions in a consecutive 60 minutes.
Email Dr. Chen (chen@dcho.us) for results and recommended placement.
Level 3 class is designed for students with a 4 or 5 in the AP Exam (or equivalence) or scored 35+ in the Local 2025, to prepare for the USNCO National Exam 2026.

Check your readiness for Level 4 Class by clicking the picture above (passcode: DChO2026) to complete 30 Multiple-Choice Questions in a consecutive 50 minutes.
Email Dr. Chen (chen@dcho.us) for results and recommended placement.
Level 4 class is designed for students who scored 35+ in the National 2025 Part I, to aim for High Honor & Camp in the USNCO National Exam 2026.

Check your readiness for Level 4 Module 3 Class by clicking the picture above (passcode: DChO2026) to complete 40 Multiple-Choice Questions in a consecutive 60 minutes.
Email Dr. Chen (chen@dcho.us) for results and recommended placement.
Level 4 Module 3 class is designed for students who completed Organic Chemistry 1 or equivalence (around first 10 chapters until Chemistry of Alkenes) to study more advanced Organic Chemistry and integrated problem solving, aiming for High Honor & Camp in the USNCO National Exam 2026.